earth



2 Sheats-Sweat. 1..

(No Model.)

G. A. EARTH.

CARRIAGE FOR DIREGT ACTING ROCK DRILLS.

Patented Peb. 1-Z, 1889 QM M444.

-(No Model.)

2 Sheets-Sheet 2.

G. A.'BARTH. CARRIAGE FOR DIRECT ACTING ROGKDRILLS.

Patented Feb. 12, 1889.

N. FKTERS. Phnlu-Lilhagmphen Washingon. D Cv GUSTAV A. EARTH, or M. LOUIS,

PATENT OFFICE.

MISSOURI, ASSIGNOR T0 PIERRE CHOUTEAU, OF SAME PLACE.

CARRIAGE FOR DIRECT-ACTING ROCK-DRlLLS.

SPECIFICATION forming part of Letters Patent No. 397,623, dated February 12, 1889.

Application filed October 18, 1888. Serial No. 288,501. (No model.)

To all whom it may concern:

Be it known that I, GUSTAV A. EARTH, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Carriages for Direct-Acting Steam or Pneumatic Rock-Drills used for Mining Purposes, of which the following is a full, clear, and exact description.

.lilyinvention relates to an improved carriage for supporting a direct-acting steam or pneumatic engine while in operation as a machine for chipping and mining purposes, and has for its object to prevent the recoil of the machine when the tool strikes the material to be dislodged, and thereby remove the strain hitherto thrown on the operator when the ma chine is mounted on wheels in the usual manner.

It consists in a horizontally-arranged block or cradle provided with bearings, in and between which is mounted the machine on pivots or trunnions, the cradle being swiveled centrally to a bed-plate provided on its under side with rollers, whereby the entire apparatus is supported and enabled to be moved along a platform or planking to which the bed-plate is securely held at any point by a hooked screw-bolt, (or bolts,) which passes through the bed-plate, and is provided with a nut and handle, so that on turning the nut in one direction the screw-bolt is raised, and its hooked portion catching against the under side of the plank securely clamps the bed-plate thereto, and thereby prevents the machine from re coiling when the blow ofthe tool is given.

'011 the accompanying drawings, Figure 1 represents a side elevation of my improved same plane, and at a suitable distance apart for receiving the pivots or trunnions c of the mining-machine d, which is mounted between and at right angles longitudinally to the beariigs b, and projects at each end beyond the cradle a.

The front end of the machine it, as seen broken away to the left of Figs. 1 and 3, carries the chipping or other mining tool with its appendages in the usual manner, while to the rear end of the machine is attached one or more handles, 6, for directing the apparatus to its work.

The cradle a is supported on and swiveled centrally to a bed-plate, f, by a circular stud or projection, g, wh ich is formed on or attached to the under side of the base of the cradle a, and fitted into a corresponding hole in the bedplate f. To the lower end of the stud or projection. g is secured a head or collar-plate, h, which bears against the bottom of a recess formed therefor in the under side of the bedplate f, so that the cradle a, while capable of rotation on the bed-plate f, is confined thereto vertically.

At suitable locations in the under side of the bed-plate f, and transversely therewith, are formed grooves 1 having semicircular beds for receiving cylindrical rollers j, which project circumferentially slightly beyond the under side of the bed-plate f and bear thereat upon a platform or planking, 7.1, between which and the bed-plate f a space or clearance is thereby left, so that when the apparatus is moved along the planking 7e frictional contact between the latter and the bed-plate f is avoided, and the entire weight of the apparatus carried by the rollers j, rotating in the grooves "i.

Formed vertically through the bed-plate f at each side thereof, (or on one side only if found preferable,) immediately beyond the edge of the plank k, is a square hole, Z, through which passes a bolt, on, having at its upper end a screw-thread which projects partly above the bed-plate f, and at its lower end a hook or catch, 01, which passes beneath and is normally out of contact with the planking is.

On the upper screwed portion of the bolt m is fitted a nut, 0, having a lever-handle, p,

and bearing at its under side against the upper surface of the bed-plate f adjacent to the hole Z.

The machine being mounted on its carriage, as above described, and supported therewith by the rollers j on the planking 7c, the entire apparatus is moved along the plank k by the handle 6 of the machine d until the latter is in the proper position for striking the ma-' terial. The operator then throws over the lever (or levers) p of the nut 0 by his foot toward the front end of the machine or into the position shown by dotted lines in Fig. 3, which causes the nut 0 to be partially rotated against the upper surface of the bed plate f and around the screwed portion of the bolt on, Which is thereby raised sufficiently to close its hook or catch 71 tightly against the under side of the planking k, and so clamp the latter and the bed-platef together, in which position the carriage is immovable endwise and the recoil of the machine transmitted to the it, screw bolt (or bolts) m, I having hook n, and nut 0, means for rotating said nut, and a block or cradle, a, having bearings b, With a direct-acting steam or pneumatic engine provided with pivots or trunnions, substantially as shown, and for the purpose described.

2. The combination of a bed-plate having rollers j and supported thereby on planking k, screw-bolt (or bolts) m, having hook 11,001- lar q, and nut 0, means for rotating said nut, and a block or cradle, a, having bearings 12, with a direct-acting steam or pneumatic engine, provided with pivots or trunnions, substantially as shown, and for the purpose described.

3. The combination of a bed-plate having rollers j and supported thereby on planking 7e, screw-bolt (or bolts) on, having hook at, collar q, nut o, and lever p, and a block or cradle a, having bearings 19, with a direct-acting steam or pneumatic engine provided with pivots or trunnions, substantially as shown, and for the purpose described.

In testimony whereof I aflix my signaturein presence 0t two witnesses this 13th day of October, 1888.

GUSTAV A. EARTH.

)Nitnesses:

S. L. SCHRADER, PAUL BAKEVVELL. 

